The Study Of CASBS Process Of The Reuse Of Recycling Water For Living Community

With the urbanization development quickening, residential areas flourish bringing on more sewage drainage. It is very difficult for water treatment plant to dispose of all sewage due to dispersive layout of residential areas. In addition, lawn, tree planting and waterscape keep raising the burden of urban water supplying, which result in the crisis of water resource. So develop the small area living dirty water rebirth exploitation, for alleviate the present condition that resources of water run short to have the actively realistic meaning.Based on the comparison of the usual domestic sewage treatment techniques in the residential districts, this study focused on the problems of treating low concentration domestic sewage with cyclic activated sludge system and improved the process to cyclic activated sludge bio-film system, which combined CASS technique with Bio-film technique by adding fillers into the main reaction zone. Under different operating conditions, such as different cycles, different aeration rates and different hydraulic retention times, a series of parallel tests were carried using CASS process and CASS process respectively.It was concluded that: the CASBS process could reduce the volume of reactor and sludge, which would cut down the cost for construction and sludge treatment. Direct filtration by quartz sand was chosen to be the advanced treatment according of the Water Quality Standard for Urban Miscellaneous Water Consumption (GB/T 18920-2002) . The water quality was COD≤30mg/L, NH＿3-N≤5mg/L, and turbidity≤2NTU. Research showed that the CASBS was feasible that using CASBS process in the treatment of domestic sewage in the residential districts.